JPH03125631A - Hydraulic fluid cooling device for forklift - Google Patents

Abstract

PURPOSE:To efficiently cool hydraulic fluid by arranging a heat exchanger unit for radiating heat of return oil in the inside of a hollow pillar which has an air inlet port at the upper part and to the lower part of which a suction pipe of an air cleaner for engine air intake is connected. CONSTITUTION:With a hollow pillar 4, an air inlet port 40 is arranged near a head guard 45 in the upper end, and an air outlet 41 is arranged at the lower end. The air outlet 41 is then connected to a suction pipe 31 of an air cleaner 3. An outlet-pipe 32 of the air cleaner 3 is connected to an engine. In this constitution, a heat exchanger unit 1 consisting of a pipe 10 for passing return oil and heat radiating fins 11 arranged on the outer peripheral surface of the pipe, is installed in the hollow pillar 4. In the heat exchanger unit 1, heat from the return oil flowing in the pipe 10 is transferred to the cool outside air F sucked from the air inlet port 40 into the hollow pillar 4. The return oil can thus be efficiently cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic oil cooling device for a forklift, and particularly to a cooling device for efficiently cooling hydraulic oil.

[Prior Art] Forklifts generally use hydraulic oil to perform cargo handling operations. Therefore, during use, the temperature of the hydraulic oil increases due to pressure loss, etc., and it may overheat.

By the way, in a standard forklift.

The hydraulic oil is cooled by cooling from the surface of the three hydraulic oil tanks.

However, in a forklift truck with a high operating rate, the hydraulic oil is overheated to, for example, 100"C or more, and therefore it is necessary to cool it to 60 to 75C.

Therefore, conventionally, cooling of the hydraulic oil is performed by an oil cooler 7 provided behind the radiator 6, as shown in FIGS. 6 and 7. In other words.

In the oil cooler 7, the fan 8 of the engine 8
Hydraulic oil is cooled using the air sent by 1.

(Issue to be solved) However, the above prior art has a third problem.

That is, 2 the oil cooler 7, as shown in FIG.
Air 9 heated by the engine 8 and radiator 6 is used to cool the hydraulic oil. Therefore, the thermal efficiency of the oil cooler is not good.

Further, the oil cooler 7 is limited in shape, size, etc. in order to avoid interference with the 5° weight muffler 82 and the like. Therefore, the oil cooler 7 cannot be made large, and its heat radiation area is therefore significantly limited.

As a result, the hydraulic fluid may not be cooled sufficiently, which may have an adverse effect on hydraulic equipment.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a hydraulic oil cooling device that can efficiently cool the heat of return oil.

[Means for solving problems]

The present invention provides a forklift comprising an air intake port provided above a hollow pillar, and a suction vibrator of an engine intake air cleaner connected below the hollow pillar.
The hydraulic oil cooling device for a forklift is characterized in that a heat exchange part for dissipating heat of the return oil is disposed in the hollow and the roller.

In the present invention, the heat exchange section is one in which, for example, a pipe equipped with fins is provided in a hollow pillar, and the heat of the return oil is dissipated within the vibe.

The above-mentioned return oil is the hydraulic oil that normally returns from control valves, hydraulic cylinders, etc. 1For example, 70°C to 120°C
This is hydraulic oil that has been superheated to C.

Further, it is preferable that the heat exchange section is installed together with a conventional oil cooler. Thereby, the hydraulic oil that could not be sufficiently cooled by the oil cooler can be cooled more efficiently by the heat exchanger (see the second embodiment).

[For production]

In the present invention, the heat of the two hydraulic fluids is dissipated in a five-order manner.

That is, during cargo handling work, the return oil first returns to the heat exchange section.

On the other hand, inside the hollow pillar, cold outside air enters from the air intake port, similar to the engine intake air cleaner. This outside air inflow is performed by the intake air of the engine.

Inside the hollow pillar, the person is exposed to the outside air.

Therefore, the heat of the returned oil is taken away by the outside air and cooled to a constant temperature.

As described above, the return oil passes through the heat exchange section provided within the hollow pillar, and is efficiently cooled by having heat removed by the cold air flowing within the hollow pillar.

(Effects) Therefore, according to the present invention, the heat of the return oil can be dissipated and
It is possible to provide a hydraulic oil cooling device for a forklift that can efficiently cool hydraulic oil.

〔Example〕

First Embodiment A hydraulic oil cooling device according to this embodiment will be explained with reference to FIGS. 1 to 5.

That is, as shown in FIGS. 1 and 2, the hydraulic oil cooling device of this example is a forklift truck in which a heat exchange section 1 is provided for dissipating the heat of the returning oil in a hollow pillar 4. .

The heat exchange section 1 includes a pipe 10 for passing return oil,
Fins 11 for heat dissipation arranged around the pipe 10
It becomes more.

The pipe 10 is constructed by bending a steel pipe for hydraulic piping into a substantially U-shape.

Further, the fins 11 are formed by arranging a plurality of iron plates in parallel in a sandwich pattern around the pipe 10.

The hollow pillar 4 has an upper herad guard 4.
An air intake port 40 is provided near the hollow pillar 4, and an air outlet 41 is provided below the hollow pillar 4.

Further, the air outlet 41 is connected to the intake pipe 31 of the engine intake air cleaner 3. Also.

An outlet vibe 32 of the air cleaner 3 is connected to an engine (not shown).

By the way, the heat exchange section 1 is provided within the hollow pillar 4.
Arrange as follows.

First, as shown in FIGS. 3 to 5, the pipe 10 is placed approximately in the center of the hollow pillar 4. As shown in FIGS.

The pipe IO is fixed within the hollow pillar 4 using the fins 11 as supporting members.

That is, the pipe 10 is fixed at its lower part by a fixing bracket 43 provided inside the hollow pillar 4.

Further, the two brackets 43 are fixed to the hollow pillar 4 with bolts 44. The pipe 10 has one lower end 101 connected to a rubber hose 12.

Further, the other lower end 102 is connected to the rubber hose 13.

The rubber hose 12 is connected to the control valve 21, and the rubber hose 13 is connected to the hydraulic oil tank 2, as shown in FIGS. 1 and 2. Also.

The hydraulic oil tank 2 is provided with a pump 22 for circulating two hydraulic oils.

In addition, the pump 22 pumps the hydraulic oil 2 in the 1 hydraulic oil tank 2.
5 is pumped up and sent to the control valve 21.

On the other hand, the fins 11 are as shown in FIG.

With the pipe 10 surrounded in a Santoi-Tsuchi shape,
It is attached to the pipe 10 by welding 111.

The fins 11 can efficiently dissipate the heat of the return oil transmitted from the pipe 10.

The pipe 10 is surrounded. Also, the fin 11.

The pipe 10 is inserted into the hollow pillar 4 to support it.

Next, two effects will be explained.

In the hydraulic oil cooling device according to this example, the heat of one hydraulic oil 25 is dissipated in a first order manner.

That is, during cargo handling work, the return oil first circulates through the hydraulic circuit 23 and returns as shown in FIGS. 1 and 2.

On the other hand, inside the hollow pillar 4, cold outside air enters from the direction F through the air intake port 40 toward the engine intake air cleaner 3.

This outside air inflow is performed by intake air from the engine. Therefore, the heat exchange section 1 is exposed to the outside air inside the hollow pillar 4.

Therefore, the heat of the returned oil is taken away by the outside air and cooled to a certain temperature (for example, 65"C or less).

As described above, the return oil passes through the heat exchange section 1 provided within the hollow pillar 4, and thereby loses heat to the air within the hollow pillar. As a result, 1 hydraulic oil is heated by the heat exchanger.
This results in efficient cooling.

Therefore, according to the fifth example, it is possible to obtain a two-hydraulic oil cooling device that can efficiently cool the return oil.

Second Embodiment A hydraulic oil cooling device according to this embodiment will be explained with reference to FIGS. 1 to 7.

That is, the cooling devices of the two examples are those in which the heat exchange section of the first example and an oil cooler (see FIGS. 6 and 7) are installed together. The other configurations are the same as those of the first embodiment.

That is, in the two examples of hydraulic oil cooling devices, the oil cooler 7 is provided behind the radiator 6. In addition, the oil cooler 7
is connected to the rubber hose 12 (see FIGS. 1 and 2) of the heat exchanger l.

In this example, the return oil is first sent to the oil cooler 7.
It is cooled to some extent by

Next, the returned oil is sent from the oil cooler 7 into the vibe 10 provided in the hollow pillar.
On the other hand, cooler air enters the pillar 4 from the air intake port 40.

Therefore, when the return oil passes through the pipe 10, its heat is dissipated from the heat exchange section. That is, the heat of the return oil is exchanged in both the cooling devices of the oil cooler and the heat exchange section, and the hydraulic oil is efficiently cooled to a constant temperature.

Therefore, according to this example, the heat of the return oil can be efficiently cooled by the two cooling devices.

[Brief explanation of the drawing]

1 to 5 show the hydraulic oil cooling device according to the first embodiment, FIG. 1 is a side view thereof, FIG. 2 is a front view thereof, and FIG.
The figure is a sectional view taken along the line X-X in FIG. 4. FIG. 4 is a sectional view taken along the Z-X arrow in FIG. 3, FIG. 5 is a sectional view taken along the Y-Y arrow in FIG. 4, and FIGS. 6 and 7 show conventional examples.
FIG. 6 is a partially cutaway side view of the forklift, and FIG. 7 is a side view showing the arrangement of an oil cooler. 1゜l 0゜2゜21゜22゜3゜31゜4゜40゜Heat exchange section. Pipe, 11° hydraulic oil tank control valve. pump. Air cleaner intake pipe. Hollow pillar air intake, 41° fins. air outlet. Substituted by Toyoda Automatic Loom Works Co., Ltd.

Claims (1)

[Scope of Claims] A forklift comprising an air intake port provided above a hollow pillar and a suction pipe of an engine intake air cleaner connected below the hollow pillar, wherein a return oil is stored in the hollow pillar. A hydraulic oil cooling device for a forklift truck, characterized by having a heat exchange section for dissipating heat.